chore: add eslint alongside prettier

[freakzlike]

This will add eslint alongside prettier. Code formatting should still work as before.

At the moment I have disabled the following rules to avoid a lot of code changes for now. I can do it at some time.

'@typescript-eslint/no-explicit-any': 'off',
'@typescript-eslint/no-non-null-assertion': 'off',
'@typescript-eslint/no-unused-vars': 'off',
'@typescript-eslint/ban-types': 'off',
'@typescript-eslint/no-empty-function': 'off',
'@typescript-eslint/ban-ts-comment': 'off',
'prefer-const': 'off',
'no-prototype-builtins': 'off'

The rule no-restricted-imports ensures that no import from src has been made and will prevent issues like #1401

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[cexbrayat]

That looks great, thanks @freakzlike

[cexbrayat]

Arf, I merged other PRs first, and this one now has a conflict. @freakzlike would you mind rebasing it please?